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    Wyświetlanie 1-7 z 7
    Tytuł:
    Analytical models for quark stars with the MIT Bag model equation of state
    Autorzy:
    Komathiraj, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193330.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Einstein-Maxwell system
    MIT bag model EOS
    exact solutions
    Opis:
    Two classes of exact solutions to the Einstein-Maxwell system is found in terms of elementary function. This is achieved by choosing a particular form for the measure of anisotropy with the MIT bag model equation of state relating the radial pressure to the energy density consistent with quark stars. These solutions contain the models found previously in the limit of vanishing charge/measure of anisotropy. Isotropic exact solutions regained include models by Komathiraj and Maharaj; Mak and Harko; and Misner and Zapolsky. A physical analysis of the matter and electromagnetic variables indicates that the model is well behaved and regular.
    Źródło:
    World Scientific News; 2021, 153, 2; 205-215
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generalized nonsingular model for compact stars electrically charged
    Autorzy:
    Malaver, Manuel
    Powiązania:
    https://bibliotekanauki.pl/articles/1157857.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Adjustable parameter
    Einstein-Maxwell system
    MIT Bag Model
    anisotropy
    metric functions
    Opis:
    We found new class of solutions to the Einstein-Maxwell system of equations for charged quark matter within the framework of MIT Bag Model considering a particular form for the measure of anisotropy and a metric function which depends on an adjustable parameter α. Variables as the energy density, charge density, radial pressure and the metric functions are written in terms of elementary and polynomial functions. We show that the form chosen for the metric function allows obtain physically acceptable solutions with any value of the adjustable parameter.
    Źródło:
    World Scientific News; 2018, 92, 2; 327-339
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Holography and Statistical Geometrodynamics
    Autorzy:
    Kabe, Koustubh
    Powiązania:
    https://bibliotekanauki.pl/articles/1192702.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Einstein gravity
    bit saturation
    chiral geometry
    holographic principle
    statistical geometrodynamics
    statistical thermodynamics
    Opis:
    The Einstein theory of relativistic gravity encoded in the General Relativity Theory (GRT) is investigated from a holographic statistical geometrophysical viewpoint done so here for the first time. In so doing, the arguments are carried out systematically and the four laws of geometrodynamics are enunciated with a proper reasonable development. To do so, new objects characterizing the quantum geometry christened “geomets” are proposed to exist and it is also proposed that there exist geometrodynamic states that these geomets occupy. The geometrodynamic states are statistical states of different curvature and when occupied determine the geometry of the spacetime domain under scrutiny and thereby tell energy-momentum how to behave and distribute. This is a different take and the theory is developed further by developing the idea that the quantities appearing in the Einstein field equations are in fact physically realistic and measurable quantities called the geometrodynamic state functions. A complete covariant geometrodynamic potential theory is then developed thereafter. Finally a new quantity called the “collapse index” is defined and how the spacetime geometry curves is shown as a first order geometrodynamic phase transition using information bit saturation instead of the concept of temperature. Relationship between purely and only geometry and information is stressed throughout. . The statistical formula relating curvature and probability is inverted and interpretation is provided. This is followed by a key application in the form of a correspondence between the Euler-Poincaré formula and the proposed “extended Gibbs formula”. In an appendix the nub of the proof of the Maldacena conjecture is provided.
    Źródło:
    World Scientific News; 2016, 30; 26-44
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some new models of anisotropic compact stars with quadratic equation of state
    Autorzy:
    Malaver, Manuel
    Powiązania:
    https://bibliotekanauki.pl/articles/1163554.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Adjustable parameter
    Einstein-Maxwell system
    Electromagnetic field
    Exact solutions
    Gravitational potential
    Relativistic objects
    Opis:
    In this paper, we studied the behavior of relativistic objects with anisotropic charged matter distribution considering a prescribed form for the gravitational potential Z(x) which depends on an adjustable parameter n. The equation of state presents a quadratic relation between the energy density and the radial pressure. New exact solutions of the Einstein-Maxwell system are generated. A physical analysis of electromagnetic field indicates that is regular in the origin and well behaved. We show as a variation of the adjustable parameter n causes a modification in the charge density, the radial pressure and the mass of the stellar object.
    Źródło:
    World Scientific News; 2018, 109; 180-194
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical models for quark stars with electric field
    Autorzy:
    Malaver, Manuel
    Powiązania:
    https://bibliotekanauki.pl/articles/1178867.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Einstein-Maxwell system
    MIT Bag Model
    adjustable parameter
    charged quark matter
    energy density
    gravitational potential
    Opis:
    We found new class of solutions to the Einstein-Maxwell system of equations for charged quark matter within the framework of MIT Bag Model considering a prescribed form of gravitational potential Z(x) used by Malaver (2016), which depends on an adjustable parameter n. Variables as the energy density, charge density, pressure and the metric functions are written in terms of elementary and polynomial functions. We show that the form chosen for the gravitational potential allows obtain physically acceptable solutions with any value of the adjustable parameter.
    Źródło:
    World Scientific News; 2017, 89; 39-47
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical models for compact stars with a linear equation of state
    Autorzy:
    Malaver, Manuel
    Powiązania:
    https://bibliotekanauki.pl/articles/1191971.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Einstein-Maxwell system
    linear equation of state
    charge density
    MIT-Bag Model
    metric function
    exact solution
    Opis:
    In this paper, we found two new classes of solutions to the Einstein-Maxwell system of equations for compact stars assuming an anisotropic pressure and a linear equation of state for the matter distribution within the framework of MIT-Bag Model with a particular form of the metric function. The exact solutions can be written in terms of elementary function in presence of an electromagnetic field. All the obtained models have a singularity in the charge density but not admit singularities in the matter and metric functions at the centre.
    Źródło:
    World Scientific News; 2016, 50; 64-73
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The theory of the Newton’s law of universal gravitation as a phenomenon of repulsion describing the proper state of the existing universe
    Autorzy:
    Borowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1075708.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Borowski’s Theory of Gravitation
    Copernicus
    Einstein
    Newton
    classical theory of gravitation
    dark matter
    dark matter pressure
    pseudo-gravity
    quantum theory of gravity
    repulsion
    Opis:
    The paper describes the logical and at the same time the proper theory of the Newton’s law of universal gravitation in the universe. It presents the observed principles of “attraction” as a phenomenon of repulsion based on the difference of dark matter pressure. This paper proves in theory that the phenomenon of “gravitation”, as a phenomenon of attraction, does not exist (no mechanisms) and is mistakenly confused with the phenomenon of repulsion.
    Źródło:
    World Scientific News; 2019, 119; 218-223
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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